Non-protected subsets of protected groups are fair game for targeting. One slide illustrated that a post attacking all white men should be taken down, while attacks on women drivers or black children are to be left up.

This is just the latest publication of Facebook's internal documents about content moderation, including how they dealt with tricky legal situations like Holocaust denial and online extremism.

Offensive content is increasingly putting Facebook and other social media giants at odds with governments around the world. A bill recently proposed in Germany would fine companies $53 million if they don't remove content quickly enough.

The problem is only going to get more complex as Facebook's user base grows — the site recently passed 2 billion monthly users.